Funny. I love Hesse, but found "The Glass Bead Game" to be incompetent SF by a literary genius who unfortunately thought that he was inventing the genre and thus didn't know how it should be done. OTOH, in general I find that when established literary authors dabble in sf they usually botch it terribly while winning great acclaim for it.

Minsky is fabulous. Popper is fairly interesting, from a historical perspective.